Improvement in paper-bag machines



UNITED STATES MARGARETT E. KNIGHT, OF BOSTON, MASSACHUSETTS."

IMPROVEMENT IN PAPER-BAG MACHINES.

Specification forming part of Letters Patent No. 116,842, dated July 1l, 1871.

To all whom 'it may concern:

Beit known that I, MARGARETT E. KNIGHT, of Boston, in the county of Suffolk and State of Massachusetts, have invented a new and Improved Machine for Making' Paper Bags; and I do hereby declare the following to be a full and correct description of the same, reference being had to the accompanying drawing, in which- Figure 1 is a front-side elevation of the machine. Fig. 2 is a plan or top view. Fig. 3 is a rear-side elevation. Fig. 4is an elevation of the feed end, and Fig. 5 is an elevation of the delivery end of the machine. Fig. 6 is a front elevation of the severing-knife and frame. Fig. 7 is a side view of the Vguide-finger. Fig. 8 is a view of one of the side-folders and its operating' parts. Fig. 9 is a perspective view of the nished bag. Figs. l0, l1, and l2 show the successive folds of the paper tube.

The same letter indicates the same part wherever it occurs.

The nature of this invention consists in the peculiar construction of a machine for the manufacture of iat or Satchel-bottom bags from a continuous tube of paper fed from a roll over a former,

' and cut,folded, pasted, and delivered in the manner substantially as hereinafter described.

ln the drawing, A marks the frame of the machine, which supports the operative parts. B is the feed-shaft, on which is a roller, C, which operates, in conjunction with a smaller roller, J', in the former H', to feed the paper. The paper is fed from a continuous roll, and is bent around the former H', with the lap on the upper side of the former. The former H' is an oblong piece of wood, attached, by a depending bracket, G', to the gallows F' on the rear end of the frame. Near its forward end the roller J' is inserted in an opening formed to receive it, and co-operates with the larger roller O on shaft B in feeding the paper. Grooves or slits in the upper edge of the former H' receive the side bars of the follower l',

v which is an oblong metallic frame, the form and position of which are clearly shown in Fig. 2. A cam, D, on shaft B next the side framing oper ates a lever, K', which is pivoted to the frame at p'. This lever is connected, by rod L' and bent lever M', to an arm, y, attached to the follower. (See Figs. 2 and` 4.) A spiral spring, Z, is attached by its free end to rod L' and by its fixed end to a cross-bar of the frame A, and reacts to draw the rod L' downward and throw the follower forward. On the outer end of shaft B, but turning loosely on it, is a cam, E, attached to a gearwheel, J, which cam operates the plate-knifefolder F. I use the term plate knife-folder to indicate the device consisting of the arms c b, blade c, and cross-brace d, and mark the whole by the letter F. The blade c of this plate-knifefolder is attached to' arm b, jointed to arms a, which are united by the cross-brace d and hinged or pivoted to the frame. A pin, e, projecting laterallyfrom one of the arms a., rests on the face of the cam E and transmits motion to the knife. The ends of the bladecwork in curved guide-ways e', which give direction to the movements of the knife, carrying the blade downward and forward during half its stroke and backwardand upward during the other half. The winch G indicates the point of application of the driving power, at the end of the shaft P, to the cogged gear H. This gear is connected with a train of gearing, by which the operation of the machine is effected. Gear H, by means of the reversing-gear I, imparts the proper motion to the gear J, carrying the cam E, which operates theI plate-lnfe-folder F, as before stated. By means of reversing-gear K it gives the appropriate motion to gear L on the end of the principal shaft Q. On shaft P is a cam, Z', Figs. 5 and 6, which operates to depress the frame of knife Z, the upward movement of said frame being given by the double spring X, which reacts in opposition to the downward motion of the cam. The spring X extends from side to side of the frame A, as shown in Figs. 4, 5, and 6, and receives the lower ends of the side pieces Y Y' of the knife-frame. On the shaft Q are fixed the two bevel-gears R and T, engaging, respectively, with the bevel-gears S and U hung to brackets on the inside of the side framing of the machine. These gears S and U operate the sidefolders Q' R' by means of eccentric pins working in the angular slots u' o' in the downwardly-project-ing shafts or stocks V V' of those side-folders. ing downward, give motion in that direction to the folder-stocks V V'` when released from the A upward action of the pins on the gears S and U. This arrangement is clearly shown` in Fig. 8. M, Fig. 5, marks a reversing-gear driven by gear L on end of shaft Q. On the same shaft as M, and attached to it, is a larger gear, N, which drives Spiral springs W W', react# cogged pinion O on the end of folding-roller S. The roller s is one of a series of rollers, r s t, at the delivering end of the machine, which receives motion from s. They are held in their places by the spring-guards c' d', which allow them the necessary amount of Iyielding play. In front of rollers 1' s, and between rollers s and t, plays the vertical knife D' attached to the rod h, having the slot t' in its" upper end, receiving the pin j, on which the rod h has vertical reciprocating motion. It is operated by lever g, having its fulcrum on end of stud 7c and pivoted to rod f, the lower end of which rod is bent around and operated downward by a cam on the inner side of gear-wheel C'. The lower end of j' is pivoted to a vibrating arm, m, pivoted to the frame, and is forced upward by a coiled spring, Z, the fixed end of which is attached to the side frame and its free end to the outer end of arm m. The gear C', which operates the knife D' by the mechanism just described, is itself driven by a reversing-gear, B', receiving motion from a gear, A', on the end of shaft Q. (See Fig. 3.) On the inner side of gear C' is a pin eccentrically-placed, which operates bent arm or lever n, to which is attached the pasting-knife Spring q tends to keep arm a up. l,This paster works over a guide, o, which directs its movements, aided by a spring. A paste-roller, b' ,is supported upon arms a' projecting up from the frame. It is supplied with paste from a suitable reservoir, and supplies paste to the blade p. From gallows E' projects downward a standard, to the lower end of which is pivoted the guide-iin ger N' ,having the roller t" on its free end. A fiat spring (see Fig. 7 attached to the standard and acting against a pin .Y on the ,upper edgeof theguide-finger tends to throw the finger downward. This spring is counteracted by the bent arm h', to which the nger is attached, and the outer end of which is operated by a cam, S', on the inside of gear A', on the end of shaft Q, as shown in Fig. 3. O", Fig. 2, marks the straight edge against which the severing-knife Z plays, and P' the metallic plate or table on which the folders operate.

Having thus described the construction of the machine, its operation is as follows: The paper from which the bags are to be made is drawn from a roll of indefinite length, suspended so as to be unwound and supplied to the machine as fast as required. It is folded around the former H', with the lap on the upper side, and the pasting, which makes it a continuous tube, is effected by suitable devices for that purpose. All these devices, being well known, are omitted from the drawing. The feed-shaft B receives interlnittent motion, by means of intermediate gears, from an eccentric gear on the opposite end of' shaft P from that to which the winch G is represented as attached, as in Fig. 2. This mode of producing a stop-motion, being a familiar one, is not represented in the drawing. The gearing is so adjusted as to arrest the motion of the shaft B, and consequently that of the paper tube, at the instant when, as hereinafter described, the folders Q' B' are holding down the forward end of the tube and the bag is being cut off from it by when the folders Q' B are drawn back and the tube is released from their grasp. The feed of the tube is produced by the action of the two rollers C and J', the former turning in contact with the bottom of the paper tube and the latter on the inside of the tube, and the two nipping the paper between them and impelling it forward. The follower I' starts with the paper and moves with it until it reaches the guide-finger N', when it is drawn back by the operation of the spring z. The blade c of the plate-knifefolder F, operated by cam E, takes the paper, which is still held open by the guide-finger N', and carries Wit under that finger, whichfas the paper passes under, pushes back the middle of the upper side of the tube, so as to give the peculiar form represented in Fig. l0 to the first fold. The blade c, still going with the paper as it feeds, passes under the side-folders Q' R' uutil the point q' of the paper is taken by the rolls rs. The plate-knife-folder F now draws back, the folders Q' R' close down upon the tube, and the feed-motion stops. The blade c now passes over the side-folders Q' B' again, making the second fold, as represented in Fig. ll, the guidefinger N' rising to let the fold of paper pass under it, and dropping again to hold it in its place. The blade c going' back, the side-folders draw apart, and the rst half of the bottom of the bag is made. The paper now passes between the rollers r s, the vertical knife D' descends and passes, with the paper, between the rolls s and t, making the third fold, represented in Fi g. l2, and completing the other half' of the bag bottom. At this point, and just before the fold is made, paste is applied to the. bottom of the bag by the paster p, which receives paste from the small pasteroller b', and is operated by its connection with the gear C', as hereinbefore described. The severing of the bag from the paper tube is effected during the arrest of the feed-motion, as hereinbefore mentioned, by a vertical knife, Z, attached to a frame and operated by the cam Z on shaft P. It plays against a steel straight-edge, 0',

parallel to the edge of the table P', (see Fig. 2,) I

the two forming a species of shears, capable of cutting paper, cloth, or any other material applicable to the manufacture of bags.

I wish to have it understood that, believing myself to be the first to invent a device to hold back or push back a point or portion of one edge of the paper tube while the blade or tuckingknife forms the first fold, represented in Fig. l0, which is the basis of the fiat-bottomed bag, I do not confine myself to any particular form, position, or mode of attaching the device referred to, which I have designated a guide-fingen7 nor limit myself to making it fixed or movable, as long as it performs the function for which I have devised and use it. I have made it in various forms, and fixed as well as movable, and having a rearward projection like a heel. The guidefmger hereinbefore described I believe to be of the best form; but other forms will answer, with the necessary modifications of the accompanying mechanism, Without altering the principle of operation by which the fold represented in Fig. 10 is made.

Having thus fully described my invention, W11 at I claim, and desire to secure by Letters Patent, 1s-

1. The follower I', constructed and operating as and for the purpose specified.

2. The plate-knife-folder F, constructed, arranged, and operating as set forth.

3. The guide-finger N', or equivalent device, Whether fixed or movable, the function of which is to hold or push back a portion of the edge of the paper tube While the fold represented in Fig. 10 is being formed.

4. The combination of a guide-fin ger with meebanism or a device for pushing the paper tube under said guide-finger, for the purpose of forming the fold represented in Fig. 10.

5. The side-folders Q R constructed, arranged, and operated by the means described, as and for the purpose specied.

The above specification of my said invention signed and witnessed at Boston this 9th day of November, A. D. 1869.

MARGARETT E. KNIGHT.

IVitnesses:

SAML. C. Moonn, JOHN WHEELOGK. 

